import java.util.Scanner;

public class Demo23 {
    private volatile static int count = 0;

    public static void main(String[] args) {
        Thread t1 = new Thread(() -> {
            while (count == 0) {
                ;      // 循环体中, 啥都没有.
                // System.out.println("t1");
            }
            System.out.println("t1 执行结束");
        });

        Thread t2 = new Thread(() -> {
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入一个整数: ");
            count = scanner.nextInt();
        });

        t1.start();
        t2.start();
    }
}